Brown sulfur dye and process of making same.



UNITED STATES PATENT curios."

MILES R. MOFFATT AND HARRY S.'SPIRA, OF PROVIDENCE, RHODE ISLAND.

BROWN SULFUR DYE AND PROCESS OF MAKING SAME.

Specification of Letters Patent.

Patented May 5, 1908.

To all whom it may concern:

Be it known that we, MrLEs R. MOFFATT and HARRY S. SPIRA, citizens of the United States, residing in Providence, in the count of Providence and State of Rhode Islan have invented a new and useful com osition of matter belonging to the class 0 sulfur dyestuffs to be used for dyeing cotton yarns and.cotton goods, of which the following is a specification.

Our composition consists of, the following ingredients, .combined in the pro ortionsstated, viz: We have obtained t -s new one part sodium sulfid dye by stirring crude wood tar with about 1 O of its weight of caustic soda previously dissolved in a little water, pouring off the hquor, and washing the residual tar several times with cold water. In this waywe remove the henols and kresols from the tar. If a much ess amount of caustic soda is used, the phenol and kresols are not completely removed and their presence can be shown by qualitative tests. less fluid than in its original crude state and is semi-solid In proceeding from this point we fuse the residual tar from the caustic soda treatment with sulfur and sodium sulfid, and we obtain a stronger dye than when crude wood tar is fused'with sulfur and sodium sulfid. For example, the pro ortions we use are and one part and one half of sulfur to one part of the residual tar. The fusion is kept u until the melt becomes dry, although as a nBe the temperature is not The tar after this treatment is much allowed to much exceed 200 C. The melted mass after cooling is broken up and powdered, or it may be dissolved in dilute sodium sulfid solution, and the dye precipitated with acid.

The dye we have obtained substantiall as described is a black owder, partly solub e in hot water, com lete y soluble in sodium sul fid from which atter solution it dyes cotton a deep brown, which is very fast to scouring and cross-dyeing and fast to light.

W hat we claim and desire to secure by Letters Patent of the United States is:

1. The process of making a sulfur dye by first treating wood-tar with alkaline solu tions until the phenol and kresolshave been removed, and then fusing the residual tar with sulfurand alkaline sulfids substantially as described.

2. As an article of manufacture, the brown dye, derived from wood tar, partly soluble in water and easily soluble in sodium sulfid from which solution it may be precipitated by acids, and capable of dyeing unmordanted cotton a brown color, fast to light, scouring and cross dyeing.

In testimony whereof we have signed our names to this specification in the presence of two .subscribing witnesses.

' MILES R. MOFFATT.

HARRY S. SPIRA. Witnesses:

WILLIAM E. REDDY, CnARLns M. Seusnnnr 

